Where is the source of mappings.wasm?

[wylieconlon]

I was just looking at this library in comparison to other libraries that do sourcemap manipulation, and found it confusing to get started because of the extra requirement that the library is initialized with web assembly. It seems like much of the explanation of the workings was done in a blog post: https://hacks.mozilla.org/2018/01/oxidizing-source-maps-with-rust-and-webassembly/

Specifically, I think the documentation is incomplete because:

• It does not explain where the source of mappings.wasm is defined- it appears to be a separate package, but there is also a version checked into the repo.
• While there is mention of initializing via ArrayBuffer Add option to initialize mappings wasm via ArrayBuffer #339, there is no example.
• The blog post I read defines mapping_callback as the key interface for the .wasm code- this seems like an important part to include in a README

[knilink]

I think this is the repo.
https://github.com/fitzgen/source-map-mappings

[adjenks]

Seems pretty out of place and disconnected. They should either be in the same repo, or this project should reference the other library in the package.json

[guimard]

Hi,
https://github.com/fitzgen/source-map-mappings seems not to be exactly the source repo: when trying to use it, I got 👍

  ✗ Errored » Asynchronous Error
      in source-map
      in test/source-map-test.js/<<PKGBUILDDIR>>/lib/reader/input-source-map-tracker.js:34
    originalPosition = maps[source].originalPositionFor(position);
                                    ^

TypeError: maps[source].originalPositionFor is not a function
    at originalPositionFor (/<<PKGBUILDDIR>>/lib/reader/input-source-map-tracker.js:34:37)
    at originalMetadata (/<<PKGBUILDDIR>>/lib/tokenizer/tokenize.js:532:43)
    at intoTokens (/<<PKGBUILDDIR>>/lib/tokenizer/tokenize.js:278:75)
    at tokenize (/<<PKGBUILDDIR>>/lib/tokenizer/tokenize.js:77:10)
    at fromStyles (/<<PKGBUILDDIR>>/lib/reader/read-sources.js:147:12)
    at fromString (/<<PKGBUILDDIR>>/lib/reader/read-sources.js:48:10)
    at doReadSources (/<<PKGBUILDDIR>>/lib/reader/read-sources.js:33:12)
    at readSources (/<<PKGBUILDDIR>>/lib/reader/read-sources.js:24:10)
    at /<<PKGBUILDDIR>>/lib/clean.js:115:12
    at processTicksAndRejections (internal/process/task_queues.js:79:11)

[ochameau]

I'll move wasm sources in this repo via #465, hopefully this will clarify and simply contribution to wasm sources!

[ochameau]

The PR landed. See my two comments over #451 (comment).